gdb/testsuite/gdb.dwarf2/nonvar-access.exp

# Copyright 2016 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Test accessing "non-variable" variables, i.e., variables which are
# optimized to a constant DWARF location expression and/or
# partially/fully optimized out.

load_lib dwarf.exp

if {![dwarf2_support]} { return 0 }

standard_testfile main.c nonvar-access-dw.S

# Make some DWARF for the test.
set asm_file [standard_output_file $srcfile2]

Dwarf::assemble $asm_file {
    cu {} {
	compile_unit {
	    {DW_AT_name main.c}
	} {
	    declare_labels int_type_label short_type_label
	    declare_labels struct_s_label struct_t_label

	    int_type_label: base_type {
		{name "int"}
		{encoding @DW_ATE_signed}
		{byte_size 4 DW_FORM_sdata}
	    }

	    struct_s_label: structure_type {
		{name s}
		{byte_size 4 DW_FORM_sdata}
	    } {
		member {
		    {name a}
		    {type :$int_type_label}
		    {data_member_location 0 DW_FORM_udata}
		    {bit_size 8 DW_FORM_udata}
		}
		member {
		    {name b}
		    {type :$int_type_label}
		    {data_bit_offset 8 DW_FORM_udata}
		    {bit_size 24 DW_FORM_udata}
		}
	    }

	    struct_t_label: structure_type {
		{name t}
		{byte_size 4 DW_FORM_sdata}
	    } {
		member {
		    {name a}
		    {type :$int_type_label}
		    {data_member_location 0 DW_FORM_udata}
		    {bit_size 9 DW_FORM_udata}
		}
		member {
		    {name b}
		    {type :$int_type_label}
		    {data_bit_offset 9 DW_FORM_udata}
		    {bit_size 23 DW_FORM_udata}
		}
	    }

	    DW_TAG_subprogram {
		{name main}
		{DW_AT_external 1 flag}
		{low_pc [gdb_target_symbol main] DW_FORM_addr}
		{high_pc [gdb_target_symbol main]+0x10000 DW_FORM_addr}
	    } {
		DW_TAG_variable {
		    {name undef_int}
		    {type :$int_type_label}
		}
		DW_TAG_variable {
		    {name undef_s}
		    {type :$struct_s_label}
		}
		DW_TAG_variable {
		    {name def_s}
		    {type :$struct_s_label}
		    {location {
			const1u 0
			stack_value
			bit_piece 8 0
			const1s -1
			stack_value
			bit_piece 24 0
		    } SPECIAL_expr}
		}
		DW_TAG_variable {
		    {name def_t}
		    {type :$struct_t_label}
		    {location {
			const1u 0
			stack_value
			bit_piece 9 0
			const1s -1
			stack_value
			bit_piece 23 0
		    } SPECIAL_expr}
		}
	    }
	}
    }
}

if { [prepare_for_testing ${testfile}.exp ${testfile} \
	  [list $srcfile $asm_file] {nodebug}] } {
    return -1
}

if ![runto_main] {
    return -1
}

gdb_test "print def_s" " = \\{a = 0, b = -1\\}"
gdb_test "print def_t" " = \\{a = 0, b = -1\\}"
gdb_test "print undef_int" " = <optimized out>"
gdb_test "print undef_s.a" " = <optimized out>"